[GitHub] [spark] cloud-fan commented on a change in pull request #29800: [SPARK-32934][SQL] Improve the performance for NTH_VALUE and reactor the OffsetWindowFunction

[GitBox <gi...@apache.org>]

cloud-fan commented on a change in pull request #29800:
URL: https://github.com/apache/spark/pull/29800#discussion_r500792651



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File path: sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExecBase.scala
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@@ -136,8 +136,15 @@ trait WindowExecBase extends UnaryExecNode {
           val frame = spec.frameSpecification.asInstanceOf[SpecifiedWindowFrame]
           function match {
             case AggregateExpression(f, _, _, _, _) => collect("AGGREGATE", frame, e, f)
+            case f: OffsetWindowSpec if f.isRelative =>
+              collect("RELATIVE_OFFSET", frame, e, f)
+            case f: OffsetWindowSpec if !f.ignoreNulls &&
+              frame.frameType == RowFrame && frame.lower == UnboundedPreceding =>
+              frame.upper match {
+                case UnboundedFollowing => collect("UNBOUNDED_OFFSET", f.fakeFrame, e, f)

Review comment:
       `UNBOUNDED_FOLLOWING_OFFSET` ?




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